She became the all-time record appearance holder for the Wales women's national football team in 2009, after making her senior international debut in 1997.

She signed for Liverpool's FA WSL rivals Doncaster Rovers Belles in January 2013, before retiring later that season.

After starting her career at Conwy Devils,[2] Foster moved to Bangor City and was the club's Northern Division top-scorer in every season from 1999–00 to 2002–03.

[7] Foster had planned to retire at the age of 30 years, but changed her mind in order to play in the FA WSL.

[11] During the 2013 mid-season break Foster left Doncaster after struggling to balance the demands of travel and training with her career outside football.

[1] She was appointed a Member of the Order of the British Empire (MBE) in the 2024 Birthday Honours "for services to association football and to women's sport".